Update yapf from 0.27.0 to 0.28.0

pyup-bot · pyup-bot · commit cd6e882b4631 · 2019-07-21T23:22:10.000+01:00
diff --git a/dev-requirements.txt b/dev-requirements.txt
@@ -26,4 +26,4 @@ twine==1.13.0
 versioneer==0.18
 vulture==1.0
 VWS-Python-Mock==2018.12.1.0
-yapf==0.27.0  # Automatic formatting for Python
+yapf==0.28.0  # Automatic formatting for Python
